Re: How do they get the answer?

I think you're being tricked by the question.

If each subject is taught by two or more teachers, and you're updating the salaries of all teachers teaching two subjects, 2 x (2+?) >= 4

Brian

kjanusz_at_att.net wrote:

> I am taking the Self-Test software test for the SQL exam
> and don't see how they get the answer to this problem.
> They don't explain how it is arrived at.
>
> Any help you can give me will be appreciated.
>
> Thanks,
> Ken Janusz, CPIM
>
> ----------------------------------
>
> Examine the structure of the TEACHER table:
>
> Name Null? Type
> ID NOT NULL NUMBER(9)
> SALARY NUMBER
> (7,2)
> SUBJECT_ID NOT NULL NUMBER(3)
> SUBJECT_DESCRIPTION VARCHAR2(2)
>
> There are 200 teachers and 15 subjects. Each subject is
> taught
> by at least 2 teachers.
>
> Evaluate this PL/SQL block:
>
> DECLARE
> v_pct_raise number := 1.10;
> BEGIN
> UPDATE teacher
> SET salary = salary * 1.10
> WHERE subject_id IN (102, 105);
> COMMIT;
> END;
>
> Which result will the PL/SQL block provide?
>
> (A) Only two teachers will receive a 10% salary increase.
> (B) All of the teachers will receive a 10% salary
> increase.
> (C) At least four teachers will receive a 10% salary
> increase.
> (D) A syntax error will occur.
>
> Answer:
> (C)
>
> --
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> --
> Author:
> INET: kjanusz_at_att.net
>
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| Brian McGraw     --     Oracle DBA |
| Central Alabama Oracle Users Group |
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-- 
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-- 
Author: Brian McGraw
  INET: brian.mcgraw_at_infinity-insurance.com

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